When in full-screen on second display via HDMI image jumps
 

I used the BSplayer to watch movies on my second TV display,
On the main display all is fine, but on the second, when I watch in full-screen the image starts to jump, it gets stuck at some point (while the sound continues normally) and jumps back and forth really fast (like a bad record or like this video : )

any ideas what that might be?